答案優(yōu)選:y'=sec^2 (x+y) *(1+y') y‘=sec^2 (x+y)/[1-sec^2 (x+y)]=-csc^2 (x+y) y''=[-csc^2 (x+y)]'=-2csc(x+y) *-csc(x+y)*cot(x+y)*(1+y')=2csc^2 (x+y) *cot(x+y)*(1-csc^2 (x+y))=-2csc^2 (x+y) *cot^3 (x+y)
求導(dǎo)csc(2x),csc(x^2) ,和 csc^2(x)
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